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  <div class="section" id="s-submitting-patches">
<span id="submitting-patches"></span><h1>Submitting patches<a class="headerlink" href="#submitting-patches" title="Permalink to this headline">¶</a></h1>
<p>We&#8217;re always grateful for patches to Django&#8217;s code. Indeed, bug reports
with associated patches will get fixed <em>far</em> more quickly than those
without patches.</p>
<div class="section" id="s-typo-fixes-and-trivial-documentation-changes">
<span id="typo-fixes-and-trivial-documentation-changes"></span><h2>Typo fixes and trivial documentation changes<a class="headerlink" href="#typo-fixes-and-trivial-documentation-changes" title="Permalink to this headline">¶</a></h2>
<p>If you are fixing a really trivial issue, for example changing a word in the
documentation, the preferred way to provide the patch is using GitHub pull
requests without a Trac ticket. Trac tickets are still acceptable.</p>
<p>See the <a class="reference internal" href="working-with-git.html"><em>Working with Git and GitHub</em></a> for more details on how to use pull requests.</p>
</div>
<div class="section" id="s-claiming-tickets">
<span id="claiming-tickets"></span><h2>&#8220;Claiming&#8221; tickets<a class="headerlink" href="#claiming-tickets" title="Permalink to this headline">¶</a></h2>
<p>In an open-source project with hundreds of contributors around the world, it&#8217;s
important to manage communication efficiently so that work doesn&#8217;t get
duplicated and contributors can be as effective as possible.</p>
<p>Hence, our policy is for contributors to &#8220;claim&#8221; tickets in order to let other
developers know that a particular bug or feature is being worked on.</p>
<p>If you have identified a contribution you want to make and you&#8217;re capable of
fixing it (as measured by your coding ability, knowledge of Django internals
and time availability), claim it by following these steps:</p>
<ul class="simple">
<li><a class="reference external" href="https://www.djangoproject.com/accounts/register/">Create an account</a> to use in our ticket system. If you have an account
but have forgotten your password, you can reset it using the
<a class="reference external" href="https://www.djangoproject.com/accounts/password/reset/">password reset page</a>.</li>
<li>If a ticket for this issue doesn&#8217;t exist yet, create one in our
<a class="reference external" href="https://code.djangoproject.com/newticket">ticket tracker</a>.</li>
<li>If a ticket for this issue already exists, make sure nobody else has
claimed it. To do this, look at the &#8220;Owned by&#8221; section of the ticket.
If it&#8217;s assigned to &#8220;nobody,&#8221; then it&#8217;s available to be claimed.
Otherwise, somebody else is working on this ticket, and you either find
another bug/feature to work on, or contact the developer working on the
ticket to offer your help.</li>
<li>Log into your account, if you haven&#8217;t already, by clicking &#8220;Login&#8221; in
the upper right of the ticket page.</li>
<li>Claim the ticket:<ol class="arabic">
<li>click the &#8220;assign to myself&#8221; radio button under &#8220;Action&#8221; near the bottom of the
page,</li>
<li>then click &#8220;Submit changes.&#8221;</li>
</ol>
</li>
</ul>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">The Django software foundation requests that anyone contributing more than
a trivial patch to Django sign and submit a <a class="reference external" href="https://www.djangoproject.com/foundation/cla/">Contributor License
Agreement</a>, this ensures that the Django Software Foundation has clear
license to all contributions allowing for a clear license for all users.</p>
</div>
<div class="section" id="s-ticket-claimers-responsibility">
<span id="ticket-claimers-responsibility"></span><h3>Ticket claimers&#8217; responsibility<a class="headerlink" href="#ticket-claimers-responsibility" title="Permalink to this headline">¶</a></h3>
<p>Once you&#8217;ve claimed a ticket, you have a responsibility to work on that ticket
in a reasonably timely fashion. If you don&#8217;t have time to work on it, either
unclaim it or don&#8217;t claim it in the first place!</p>
<p>If there&#8217;s no sign of progress on a particular claimed ticket for a week or
two, another developer may ask you to relinquish the ticket claim so that it&#8217;s
no longer monopolized and somebody else can claim it.</p>
<p>If you&#8217;ve claimed a ticket and it&#8217;s taking a long time (days or weeks) to code,
keep everybody updated by posting comments on the ticket. If you don&#8217;t provide
regular updates, and you don&#8217;t respond to a request for a progress report,
your claim on the ticket may be revoked.</p>
<p>As always, more communication is better than less communication!</p>
</div>
<div class="section" id="s-which-tickets-should-be-claimed">
<span id="which-tickets-should-be-claimed"></span><h3>Which tickets should be claimed?<a class="headerlink" href="#which-tickets-should-be-claimed" title="Permalink to this headline">¶</a></h3>
<p>Of course, going through the steps of claiming tickets is overkill in some
cases.</p>
<p>In the case of small changes, such as typos in the documentation or
small bugs that will only take a few minutes to fix, you don&#8217;t need to jump
through the hoops of claiming tickets. Just submit your patch and be done with
it.</p>
<p>Of course, it is <em>always</em> acceptable, regardless whether someone has claimed it
or not, to submit patches to a ticket if you happen to have a patch ready.</p>
</div>
</div>
<div class="section" id="s-patch-style">
<span id="s-id1"></span><span id="patch-style"></span><span id="id1"></span><h2>Patch style<a class="headerlink" href="#patch-style" title="Permalink to this headline">¶</a></h2>
<p>Make sure that any contribution you do fulfills at least the following
requirements:</p>
<ul class="simple">
<li>The code required to fix a problem or add a feature is an essential part
of a patch, but it is not the only part. A good patch should also include a
<a class="reference internal" href="unit-tests.html"><em>regression test</em></a> to validate the behavior that has been
fixed and to prevent the problem from arising again. Also, if some tickets
are relevant to the code that you&#8217;ve written, mention the ticket numbers in
some comments in the test so that one can easily trace back the relevant
discussions after your patch gets committed, and the tickets get closed.</li>
<li>If the code associated with a patch adds a new feature, or modifies
behavior of an existing feature, the patch should also contain
documentation.</li>
</ul>
<p>You can use either GitHub branches and pull requests or direct patches
to publish your work. If you use the Git workflow, then you should
announce your branch in the ticket by including a link to your branch.
When you think your work is ready to be merged in create a pull request.</p>
<p>See the <a class="reference internal" href="working-with-git.html"><em>Working with Git and GitHub</em></a> documentation for mode details.</p>
<p>You can also use patches in Trac. When using this style, follow these
guidelines.</p>
<ul class="simple">
<li>Submit patches in the format returned by the <tt class="docutils literal"><span class="pre">git</span> <span class="pre">diff</span></tt> command.
An exception is for code changes that are described more clearly in
plain English than in code. Indentation is the most common example; it&#8217;s
hard to read patches when the only difference in code is that it&#8217;s
indented.</li>
<li>Attach patches to a ticket in the <a class="reference external" href="https://code.djangoproject.com/newticket">ticket tracker</a>, using the &#8220;attach
file&#8221; button. Please <em>don&#8217;t</em> put the patch in the ticket description
or comment unless it&#8217;s a single line patch.</li>
<li>Name the patch file with a <tt class="docutils literal"><span class="pre">.diff</span></tt> extension; this will let the ticket
tracker apply correct syntax highlighting, which is quite helpful.</li>
</ul>
<p>Regardless of the way you submit your work, follow these steps.</p>
<ul class="simple">
<li>Make sure your code matches our <a class="reference internal" href="coding-style.html"><em>Coding style</em></a>.</li>
<li>Check the &#8220;Has patch&#8221; box on the ticket details. This will make it
obvious that the ticket includes a patch, and it will add the ticket to
the <a class="reference external" href="https://code.djangoproject.com/query?status=new&amp;status=assigned&amp;status=reopened&amp;has_patch=1&amp;order=priority">list of tickets with patches</a>.</li>
</ul>
</div>
<div class="section" id="s-non-trivial-patches">
<span id="non-trivial-patches"></span><h2>Non-trivial patches<a class="headerlink" href="#non-trivial-patches" title="Permalink to this headline">¶</a></h2>
<p>A &#8220;non-trivial&#8221; patch is one that is more than a simple bug fix. It&#8217;s a patch
that introduces Django functionality and makes some sort of design decision.</p>
<p>If you provide a non-trivial patch, include evidence that alternatives have
been discussed on <a class="reference internal" href="../../mailing-lists.html#django-developers-mailing-list"><em>django-developers</em></a>.</p>
<p>If you&#8217;re not sure whether your patch should be considered non-trivial, just
ask.</p>
</div>
<div class="section" id="s-deprecating-a-feature">
<span id="deprecating-a-feature"></span><h2>Deprecating a feature<a class="headerlink" href="#deprecating-a-feature" title="Permalink to this headline">¶</a></h2>
<p>There are a couple reasons that code in Django might be deprecated:</p>
<ul class="simple">
<li>If a feature has been improved or modified in a backwards-incompatible way,
the old feature or behavior will be deprecated.</li>
<li>Sometimes Django will include a backport of a Python library that&#8217;s not
included in a version of Python that Django currently supports. When Django
no longer needs to support the older version of Python that doesn&#8217;t include
the library, the library will be deprecated in Django.</li>
</ul>
<p>As the <a class="reference internal" href="../../release-process.html#internal-release-deprecation-policy"><em>deprecation policy</em></a> describes,
the first release of Django that deprecates a feature (<tt class="docutils literal"><span class="pre">A.B</span></tt>) should raise a
<tt class="docutils literal"><span class="pre">RemovedInDjangoXXWarning</span></tt> (where XX is the Django version where the feature
will be removed) when the deprecated feature is invoked. Assuming
we have a good test coverage, these warnings will be shown by the test suite
when <a class="reference internal" href="unit-tests.html#running-unit-tests"><em>running it</em></a> with warnings enabled:
<tt class="docutils literal"><span class="pre">python</span> <span class="pre">-Wall</span> <span class="pre">runtests.py</span></tt>. This is annoying and the output of the test suite
should remain clean. Thus, when adding a <tt class="docutils literal"><span class="pre">RemovedInDjangoXXWarning</span></tt> you need
to eliminate or silence any warnings generated when running the tests.</p>
<p>The first step is to remove any use of the deprecated behavior by Django itself.
Next you can silence warnings in tests that actually test the deprecated
behavior in one of two ways:</p>
<ol class="arabic">
<li><p class="first">In a particular test:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">warnings</span>

<span class="k">def</span> <span class="nf">test_foo</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
    <span class="k">with</span> <span class="n">warnings</span><span class="o">.</span><span class="n">catch_warnings</span><span class="p">(</span><span class="n">record</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span> <span class="k">as</span> <span class="n">w</span><span class="p">:</span>
        <span class="n">warnings</span><span class="o">.</span><span class="n">simplefilter</span><span class="p">(</span><span class="s">&quot;always&quot;</span><span class="p">)</span>
        <span class="c"># invoke deprecated behavior</span>
    <span class="c"># go ahead with the rest of the test</span>
</pre></div>
</div>
</li>
<li><p class="first">For an entire test case, <tt class="docutils literal"><span class="pre">django.test.utils</span></tt> contains three helpful
mixins to silence warnings: <tt class="docutils literal"><span class="pre">IgnorePendingDeprecationWarningsMixin</span></tt>,
<tt class="docutils literal"><span class="pre">IgnoreDeprecationWarningsMixin</span></tt>, and
<tt class="docutils literal"><span class="pre">IgnoreAllDeprecationWarningsMixin</span></tt>. For example:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">django.test.utils</span> <span class="kn">import</span> <span class="n">IgnorePendingDeprecationWarningsMixin</span>

<span class="k">class</span> <span class="nc">MyDeprecatedTests</span><span class="p">(</span><span class="n">IgnorePendingDeprecationWarningsMixin</span><span class="p">,</span> <span class="n">unittest</span><span class="o">.</span><span class="n">TestCase</span><span class="p">):</span>
    <span class="o">...</span>
</pre></div>
</div>
</li>
</ol>
<p>Finally, there are a couple of updates to Django&#8217;s documentation to make:</p>
<ol class="arabic simple">
<li>If the existing feature is documented, mark it deprecated in documentation
using the <tt class="docutils literal"><span class="pre">..</span> <span class="pre">deprecated::</span> <span class="pre">A.B</span></tt> annotation. Include a short description
and a note about the upgrade path if applicable.</li>
<li>Add a description of the deprecated behavior, and the upgrade path if
applicable, to the current release notes (<tt class="docutils literal"><span class="pre">docs/releases/A.B.txt</span></tt>) under
the &#8220;Features deprecated in A.B&#8221; heading.</li>
<li>Add an entry in the deprecation timeline (<tt class="docutils literal"><span class="pre">docs/internals/deprecation.txt</span></tt>)
under the <tt class="docutils literal"><span class="pre">A.B+2</span></tt> version describing what code will be removed.</li>
</ol>
<p>Once you have completed these steps, you are finished with the deprecation.
In each major release, all <tt class="docutils literal"><span class="pre">RemovedInDjangoXXWarning</span></tt>s matching the new
version are removed.</p>
</div>
<div class="section" id="s-javascript-patches">
<span id="javascript-patches"></span><h2>Javascript patches<a class="headerlink" href="#javascript-patches" title="Permalink to this headline">¶</a></h2>
<p>Django&#8217;s admin system leverages the jQuery framework to increase the
capabilities of the admin interface. In conjunction, there is an emphasis on
admin javascript performance and minimizing overall admin media file size.
Serving compressed or &#8220;minified&#8221; versions of javascript files is considered
best practice in this regard.</p>
<p>To that end, patches for javascript files should include both the original
code for future development (e.g. <tt class="docutils literal"><span class="pre">foo.js</span></tt>), and a compressed version for
production use (e.g. <tt class="docutils literal"><span class="pre">foo.min.js</span></tt>). Any links to the file in the codebase
should point to the compressed version.</p>
<div class="section" id="s-compressing-javascript">
<span id="compressing-javascript"></span><h3>Compressing JavaScript<a class="headerlink" href="#compressing-javascript" title="Permalink to this headline">¶</a></h3>
<p>To simplify the process of providing optimized javascript code, Django
includes a handy python script which should be used to create a &#8220;minified&#8221;
version. To run it:</p>
<div class="highlight-python"><div class="highlight"><pre>python django/contrib/admin/bin/compress.py
</pre></div>
</div>
<p>Behind the scenes, <tt class="docutils literal"><span class="pre">compress.py</span></tt> is a front-end for Google&#8217;s
<a class="reference external" href="https://developers.google.com/closure/compiler/">Closure Compiler</a> which is written in Java. However, the Closure Compiler
library is not bundled with Django directly, so those wishing to contribute
complete javascript patches will need to download and install the library
independently.</p>
<p>The Closure Compiler library requires Java version 6 or higher (Java 1.6 or
higher on Mac OS X. Note that Mac OS X 10.5 and earlier did not ship with
Java 1.6 by default, so it may be necessary to upgrade your Java installation
before the tool will be functional. Also note that even after upgrading Java,
the default <tt class="docutils literal"><span class="pre">/usr/bin/java</span></tt> command may remain linked to the previous Java
binary, so relinking that command may be necessary as well.)</p>
<p>Please don&#8217;t forget to run <tt class="docutils literal"><span class="pre">compress.py</span></tt> and include the <tt class="docutils literal"><span class="pre">diff</span></tt> of the
minified scripts when submitting patches for Django&#8217;s javascript.</p>
</div>
</div>
</div>


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  <h3><a href="../../../contents.html">Table Of Contents</a></h3>
  <ul>
<li><a class="reference internal" href="#">Submitting patches</a><ul>
<li><a class="reference internal" href="#typo-fixes-and-trivial-documentation-changes">Typo fixes and trivial documentation changes</a></li>
<li><a class="reference internal" href="#claiming-tickets">&#8220;Claiming&#8221; tickets</a><ul>
<li><a class="reference internal" href="#ticket-claimers-responsibility">Ticket claimers&#8217; responsibility</a></li>
<li><a class="reference internal" href="#which-tickets-should-be-claimed">Which tickets should be claimed?</a></li>
</ul>
</li>
<li><a class="reference internal" href="#patch-style">Patch style</a></li>
<li><a class="reference internal" href="#non-trivial-patches">Non-trivial patches</a></li>
<li><a class="reference internal" href="#deprecating-a-feature">Deprecating a feature</a></li>
<li><a class="reference internal" href="#javascript-patches">Javascript patches</a><ul>
<li><a class="reference internal" href="#compressing-javascript">Compressing JavaScript</a></li>
</ul>
</li>
</ul>
</li>
</ul>

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